I'm having some problems with getting X to start on a PowerMac G4 with an ATI
Rage 128 video card with 16MB Video RAM... sometimes on boot, I get "aty128fb:
Invalid ROM signature 1111 should be 0xaa55" and it hangs, and sometimes it gets
the error, but is able to get past it, but then X can't start, with an error of
(EE) R128(0): Cannot read V_BIOS (5) and then  (EE) R128(0): No DFP detected.

/etc/xorg.conf has the video card configured thusly:
Section "Device"
     Identifier  "Videocard0"
     Driver    "r128"
     VendorName  "Videocard vendor"
     BoardName  "ATI Rage 128"
EndSection

Here is the output from lspci:

[root@gordon ~]# lspci
00:0b.0 Host bridge: Apple Computer Inc. UniNorth AGP
00:10.0 VGA compatible controller: ATI Technologies Inc Rage 128 PF/PRO AGP 4x TMDS
0001:10:0b.0 Host bridge: Apple Computer Inc. UniNorth PCI
0001:10:0d.0 PCI bridge: Digital Equipment Corporation DECchip 21154 (rev 05)
0001:11:07.0 Class ff00: Apple Computer Inc. KeyLargo Mac I/O (rev 02)
0001:11:08.0 USB Controller: Apple Computer Inc. KeyLargo USB
0001:11:09.0 USB Controller: Apple Computer Inc. KeyLargo USB
0001:11:0a.0 FireWire (IEEE 1394): Texas Instruments TSB12LV23 IEEE-1394 Controller
0002:21:0b.0 Host bridge: Apple Computer Inc. UniNorth Internal PCI
0002:21:0f.0 Ethernet controller: Apple Computer Inc. UniNorth GMAC (Sun GEM)
(rev 01)


Trying to start X manually results in this:

X Window System Version 6.8.2
Release Date: 9 February 2005
X Protocol Version 11, Revision 0, Release 6.8.2
Build Operating System: Linux 2.6.9-1.906_EL ppc [ELF] 
Current Operating System: Linux gordon.thtoolbox.com 2.6.11-1.1369_FC4 #1 Thu
Jun 2 22:58:26 EDT 2005 ppc
Build Date: 02 June 2005
Build Host: sizzler.build.redhat.com
 
        Before reporting problems, check http://wiki.X.Org
        to make sure that you have the latest version.
Module Loader present
OS Kernel: Linux version 2.6.11-1.1369_FC4 (bhcompile@cure81.build.redhat.com)
(gcc version 4.0.0 20050525 (Red Hat 4.0.0-9)) #1 Thu Jun 2 22:58:26 EDT 2005 
Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Wed Jun 22 15:25:51 2005
(==) Using config file: "/etc/X11/xorg.conf"
(EE) R128(0): Cannot read V_BIOS (5)
(EE) R128(0): No DFP detected

   *** If unresolved symbols were reported above, they might not
   *** be the reason for the server aborting.

Fatal server error:
Caught signal 7.  Server aborting


Please consult the The X.Org Foundation support 
         at http://wiki.X.Org
 for help. 
Please also check the log file at "/var/log/Xorg.0.log" for additional information.


Joel